Feature:1. With accurate scale, convenient operation and can effective saving timber.2. The centering ruler is specially designed for woodworking lovers to quickly find the center and size of the wood circle.3. Acrylic material is environmentally friendly and durable, with good light transmission and high clarity.4. Strict quality control and quality assurance, high safety factor, can be used with peace of mind.5. The diameter is 200mm, the thickness is 3mm, and the measurement accuracy is 1.Specification:Item Type: Center Finder CompassSize: Approx. 30.5cm / 12inMaterial: Transparent acrylicDiameter: Approx. 200mm / 7.9inThickness: Approx. 3mm / 0.1inMeasuring Range: Approx. 1mm / 0.04inMeasurement Accuracy: 1Size: Approx. 20.3cm / 8in.Package List:1 x Center Finder Compass